import React, { Component } from 'react';

class App extends Component {
  state={
    value:'1',
    checked:false,
  }
  render() {
    return (
      <div>
        {/* <input type="text" name="" id="" value={this.state.value} readOnly/> */}
        {/* <input type="text" defaultValue={this.state.value}/> */}
        {/* <input type="checkbox" name="" id="" defaultChecked={this.state.checked}/> */}
      {/* <input type="checkbox" name="" id="" defaultChecked={this.state.checked}/> */}

      <input type="text" value={null}/>
      </div>
    );
  }
}

export default App;